Fig. 4From: Evaluation of protective efficacy induced by virus-like particles containing a Trichinella spiralis excretory-secretory (ES) protein in mice Trichinella spiralis-specific antibody responses upon challenge infection. Immunized mice were challenge-infected orally with T. spiralis Korean isotype at week 4 after boost and T. spiralis-specific IgG, IgG1 and IgG2a antibody responses (a, b and c, *P < 0.05; **P < 0.01) and the ratio of IgG1 to IgG2a in the sera were determined (d)Back to article page